Improvement in saw-mills



1an. SHW- CIRCULAR SAW MILL.4

`Patented Nov. l, 1864.

UNITED STATES PATENT OFFICE.

IM PROVEMENT IN SAW-MILLS Speeilieat-ion forming;- part of LettersPatent No. 44.897, dated November 1,1554.

1'0 nl( yzrhom it may concern:

lie it known that l, l). 1).-S1Utw, ot' Carson (lity, in the county ot'Ormsby and Territory ol' Nevada, have invented a new and usefulImprovement in Circular-Saw Mills; and I do hereby declare that thefollowing isa t'ull, clear, and exact description thereof', which willenable others skilled in the art to make and use the same, rel'ereneebeing had to the accompanyingl drawings, formiuga partof thisspecilication, in which- 4Figure. l is a side sectional view of my invnption taken in the, linefrhr. File. 2; Fig. 2, a plm or top view otthe saine.

Similar letters ot' rclerence indicate like parts.

This invention relates to a new and uset'ul nleaust'ordrivinel circularsaws and controlling' the feedsmovement ot' the carriage on which thestut'l.' to be sa wed is placed and dogged.

The invention consists in the employment or use ol'a tightenerarraugg'ed with two belts, as hereinal'ter shown and described, wherebyeither belt maybe rendered operative or inoperative, as desired, and theteeddriving' belt 1n ide, when required, to operate as a brake for thefeed mechanism ofthe carriage.

A represents the trainings,` of the saw-mill, which may be constructedin any proper manner to support the working parts, and l is a shat'twhich has a. pulley, O, upon it, and also a pulley, l), the latter beingmuch larger iu diameter than O, as shown in Fig. 2.

E is a belt which passes around the pulley U and a pulley, l", ou thesaw'shatt G, and 1I is a belt which passes around the pulley D and apulley, I, on a shaft, J', which also has a conepulley, K, upon it,around which anda re. verse.-cone pulley, l', on the saw-shaft (it, across-belt, li, passes, which is adjusted by a shipper M.

N is a shalt titte'd or placed in the upper part otthc framing A, andhaving' a small frame, O, projecting from its ends at opposite sides, inwhich pulleys l l" are placed. A lever, Q, is attached to this shaft torthe purpose ot' turning' it, and the pulley l is over the belt E, andthe pulley P over the beltIl, and said pulleys have, such a relativeposition with their respective belts that when one pulley is pressed incontact with the belt undcr neath it the other will beraised from itsbelt. When the pulley l is on the belt ]l, pressed thereon by thegravity of the lever Q., the carriage is driven in a working direction,or fed to the saw, through the medium of the belts H 'L and the usual,gearing connected with the'shai't lt. kBy raising the lever Q so thatthe pulley l will press upon the belt E, the` g'igging-back movement isgiven the carriage, and this movement maybe checked, to prevent thecarriage being,l gigged back too far, by depressing the lever so thatthe pulley t will press upon the belt H, in which case the gigging' backmotion is checked and entirely stopped, it' desired, in consequence otthe belt li beinr a cross one and the belt E a straight one. Py having,`the lever Q held by a cateh, it, so that neither ofthe pulleys I or l'lwill rest upon their respective belts, the carriage. will not be movedin either direction.

llaviug thus described my invention, I cla-im as new and desire tosecure by Letters Patent-- The belt-tighteuer formed or constructed withthe two pulleys l l", arranged as shown, iu connection with the twobelts E H and cross belt L, all arranged with the saw-shaft Gr and shaftl-, to operate substantially as and for the purpose set t'orth.

l. D. SHAW.

Witnesses:

S. lioitiNGnAat, C. A. Bunce.

